Brivaracetam (alfaR, 4S)-Isomer, CAS 357336-99-3, es una impureza estereoisomérica asociada al antiepiléptico derivado de pirrolidona brivaracetam. Con fórmula molecular C11H20N2O2 y peso molecular 212.29 g/mol, conserva la misma composición elemental que la sustancia principal, pero difiere en la configuración absoluta del centro quiral. Puede originarse durante la síntesis asimétrica, por epimerización o por deriva configuracional bajo condiciones de proceso. Su evaluación es pertinente en el perfil de impurezas porque los isómeros estereoisoméricos pueden modificar la selectividad farmacológica y la pureza óptica. Su determinación suele requerir LC quiral, LC-MS/MS o espectrometría de masas de alta resolución, con confirmación ortogonal por RMN y métodos polarimétricos cuando procede.
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